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Northamerican archaic skulls, mandibles, and metapodials
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Skull proportions, excluding the size of the preorbital ‘bar’ (32): Hypo, Mega, & Parahippus (Ratio diagrams, 8 variables)
Monday 31 May 2010
Skull proportions, excluding the size of the preorbital ‘bar’ (32): Dinohippus & Pliohippus (Ratio diagrams, 8 variables)
Monday 31 May 2010
Dinohippus and Pliohippus
Dinohippus 11724, 87201, and Pliohippus 12998 have similar proportions (Dino-Plio 1) but only the last one has a well developped POF.
Five other skulls are all different (Dino-Plio 2).
Skull proportions, excluding the size of the preorbital ‘bar’ (32): Group B (Ratio diagrams, 8 variables)
Monday 31 May 2010
Group B.
B-1. Thirteen skulls referrable to Cormohipparion B, differ from the group A mostly by their longer naso-incisival notches. They tend also to have longer muzzles and shorter palates.
B-2. Two skulls are similar but quite smaller.
B-3. Five skulls have a long muzzle.
B-4. One (…)
Skull proportions, excluding the size of the preorbital ‘bar’ (32): Group A (Ratio diagrams, 8 variables)
Monday 31 May 2010
Group A.
A-1 : Height adult skulls and two juveniles may be easily referred to Cormohipparion A. They are characterized by relatively long palates (2), wide muzzles 15), and short naso-incisival notches (NNI=30).
A-2 : Sixteen skulls are similar but smaller, and have a deeper naso-incisival (…)
Skull proportions, excluding the size of the preorbital ‘bar’ (32): Lakotahippus s.l. (Ratio diagrams, 8 variables)
Monday 31 May 2010
As the variation is the largest for measures of the fossa, especially its distance from the orbit (’bar’: mesure 32), I have drawn separate ratio digrams for other dimensions: 5=post-palatal length; 23=anterior ocular line; 2=palatal length; 1=muzzle length; 15=maximal muzzle breadth; 9=P2-M3 (…)
Craniological definitions of Groups A and B, and of Cormohipparions (Northamerican archaic skulls, mandibles, and metapodials)
Monday 31 May 2010
Craniological definition of Group A versus Group B
The first scatter diagram (SD-1) shows that Group A is characterized by a short naso-incisival notch (NIN=30), Group B – by a long NIN relative to the length of the cheek (31). Craniological definition of Cormohipparions versus other (…)
University of California at Riverside (Skull measurements, data)
Monday 31 May 2010
University of Nebraska Natural Sciences Museum (Skull measurements, data)
Monday 31 May 2010
Chicago Field Museum (Skull measurements, data)
Monday 31 May 2010
American Museum of Natural History (Skull measurements, data)
Monday 31 May 2010
Except Echo and Xmas
